I think it'd be B.. I might be wrong tho..
The answer is tropical savanna. The region’s ecosystem is characterized by tall grasses,
shrubs, and a scattered distribution of trees (especially acacia trees).
Large regions of tropical savanna extend through the nations of Botswana,
Namibia, and Kenya in Africa. Savannas are also characterized
by seasonal water availability, with the majority of rainfall confined to one
season. They are frequently found in transitional zones between forest and
desert or grassland.
<span>increased crop yields Because i looked it up lol
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Your teacher likes to copy. Found this at https://examples.yourdictionary.com/examples-of-keystone-species.html
Grizzly bears: As predators, bears keep down the numbers of several species, like moose and elk. They also carry and deposit seeds throughout the ecosystem. Bears that eat salmon will leave their dropping and the partially eaten remains that provide nutrients such as sulfur, nitrogen and carbon to the soil.